Zappers have been known to help such conditions. So can colloidal silver swished and swallowed.
Another option I highly recommend is to get the colloidal silver skin and scalp bar from Utopia Silver (use the CZ discount code of LR001 to get 15% off) and brush your teeth with it. It pretty well wipes out most gum disease and plaque with regular use since it contains colloidal silver. Plus it has 75 plant derived trace minerals to help with re-mineralization. And aloe and juniper oil. Good stuff!
Now, regarding those root canals - you really should see:
Root canals are evil poison and disease factories - worse for you even than amalgam fillings.
Yes, it is not necessarily a pleasant choice but a good one. Implants might be a better option, though the healhiest is probably partials if that is a viable option instead of full dentures. Leaving them in looks like almost a guarantee for problems to me. I think I have at least a couple myself that I need to attend to when money permits. In the meanwhile, live as healthily as possible and take some good natural immune boosters and anti-virals.